Vray lighting problem

[eidam655]

hello all,

i'm working on a school project and thought i could ask some questions about problems i'm facing. images in attachments. on the 'colder' one, more blueish, the GI Saturation was 1.0 and the Light Cache Subdivision was set to 300 (the original images are rendered at 5000 x 5000 px, these are crops). on the warmer one i reduced the saturation to .25 and increased the subdivision to 1000.

in both of the images if you look at the edges where a sun-lit facade meets the ground, you'll see that that area is somehow too bright (it's a problem when it affects the shadow of the opposite building)

i would like to ask two questions:

• how is my problem called, ie. what to google solution for? (it's most probably not color bleeding... it's hard to UTFG when you don't know what you are searching for )
• and if anyone had any idea - how do i fix this?

thanks for any answer,
~Adam

EDIT: of course, the attachments x)

[valerostudio]

I do believe the issue is your GI bouncing in the corners off of that white material. I never use pure white. I would try something thats 229 229 299 RGB value or less. No material in the real world is ever pure white 255 255 255. Try that for starters.

[stefanq]

When you use high quality settings for IM (subdivisions and such) you're starting to loose detail, geometry is "floating". Lower the settings, or, use detail enhancement, or, my favorite one, use AO.
Cheers!